Is this an exact token count?

No, this tool provides an estimate based on the standard heuristic that 1 token ≈ 4 characters. Exact token counts depend on the specific tokenizer (like tiktoken for OpenAI or the sentencepiece model for Llama) used by the API.

Does this send my text to OpenAI or Anthropic?

No. The calculation happens entirely within your web browser. Your text is never sent to any external server or API, ensuring complete privacy.

Why are output tokens more expensive than input tokens?

Reading text (input) is computationally much easier and faster for a Large Language Model than generating new text (output). Because generating tokens requires more server compute power, providers like OpenAI and Anthropic charge a premium for output tokens.

How accurate is the 4-character per token heuristic?

For standard English text, the 4-character heuristic is highly accurate (often within a 5% margin of error). However, for languages with different alphabets (like Japanese or Arabic), or for text containing heavy code syntax and JSON formatting, the number of tokens per character will be higher.

Are the API prices up to date?

We strive to keep the pricing table updated with the latest official rates from OpenAI, Anthropic, Google, and Groq. However, providers change their pricing frequently, so always verify the exact costs on the provider's official pricing page for production applications.

Can I use this tool offline?

Yes! Once the page has loaded in your browser, the token calculation logic runs locally. You can disconnect from the internet and continue to paste text and estimate token costs without any issues.

LLM Token Calculator

Estimate token usage and API costs for popular Large Language Models based on your input text length.

Estimates use the standard heuristic: 1 token ≈ 4 characters. Actual tokenization may vary by model and language. Prices last verified June 2026 — always confirm at the provider's official pricing page .

Prompt / Document

0 chars·0 words

Target Model

Estimated Tokens

≈ 0k tokens

Cost Estimate (USD)

Input (Prompt)$< $0.000001

Output (Same length)$< $0.000001

Total (Round Trip)$0.000000

Current rates for GPT-4o:

Input$2.50 / 1M tokens

Output$10.00 / 1M tokens

Verify pricing

The LLM Token Calculator is a fast, browser-based tool designed to estimate token counts and associated API costs for popular Large Language Models (LLMs) like OpenAI's GPT-4o, Anthropic's Claude 3.5, and Google's Gemini.

What Is the LLM Token Calculator?

When developers build applications using generative AI APIs, they are billed based on "tokens" rather than traditional metrics like megabytes or monthly subscriptions. A token is a chunk of text—it can be a single character, a syllable, or a whole word.

The LLM Token Calculator applies an industry-standard heuristic (where 1 token is approximately equal to 4 characters of English text) to instantly estimate how many tokens a given block of text will consume. It then cross-references this token count against the current pricing models of leading AI providers to give you an estimated cost.

How to Use the LLM Token Calculator

To calculate your API costs, simply paste or type your prompt (the text you plan to send to the AI) into the input area. The tool will immediately count the characters and calculate the estimated token count.

Below the input box, you will see a detailed pricing breakdown table. This table shows the estimated "Input Cost" (the cost of sending your prompt to the API) for various models, including GPT-4o, Claude 3.5 Sonnet, Gemini 1.5 Pro, and Llama 3. You can also specify an "Estimated Output Tokens" count to calculate the total round-trip cost of the API call.

Common Use Cases

Software developers use this tool before writing backend logic to estimate the financial feasibility of an AI feature. AI researchers use it to calculate the cost of processing massive datasets or documents through a specific model. Freelance writers and prompt engineers use it to optimize their prompts, trimming unnecessary words to keep API costs down for their clients.

Privacy and Browser-Based Processing

Because privacy is paramount when dealing with proprietary prompts or sensitive data, this calculator runs entirely within your web browser. Your text is never transmitted to OpenAI, Anthropic, or any FluxToolkit server. The token calculation is done locally using client-side JavaScript, ensuring 100% data security.

Frequently Asked Questions

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